DESCRIPTION
The SGS-THOMSON Microelectronics ST75C520 chip is a highly integrated modem engine, which can operate with all currently used FAX group III standards up to 14400bps. Full V.21, V.23 and Bell 103 full duplex modem standards are implemented.

■ ITU-T V.17, V.29, V.27ter, V.21 WITH FAX SUPPORT
■ ITU-T V.23, V.21, BELL 103
■ V.17, V.29 (T104), V.27ter SHORT TRAINS
■ V.33 HALF-DUPLEX
■ 1800Hz OR 1700Hz CARRIER
■ SINGLE CHIP COMPLETE DATA PUMP
■ SINGLE 5V POWER SUPPLY :
   - TYPICAL ACTIVE POWER CONSUMPTION : 375mW
   - LOW POWER MODE (typ. 5mW)
■ EXTENDED MODES OF OPERATIONS :
   - FULL IMPLEMENTATION OF THE V.17, V.33, V.29 AND V.27ter HANDSHAKES
   - AUTODIAL AND AUTOANSWER CAPABILITY
   - PROGRAMMABLE TONE DETECTION AND FSK V.21 FLAG PATTERN DETECTION DURING HIGH SPEED RECEPTION
   - PROGRAMMABLE CALL PROGRESS AND CALL WAITING TONE DETECTORS INCLUDING DTMF
   - PROGRAMMABLE CLASS™ DETECTION CAPABILITY
   - WIDE DYNAMIC RANGE (>48dB)
   - A-LAW VOICE PCM MODE
■ VERSATILE INTERFACES :
   - PARALLEL 64 x 8-BIT DUAL PORT RAM
   - SYNCHRONOUS/HDLC PARALLEL DATA HANDLING
   - HDLC FRAMING SUPPORT
   - V.24 INTERFACE
   - FULL OPERATING STATUS REAL TIME MONITORING
   - FULL DIAGNOSTIC CAPABILITY
   - DUAL 8-BIT DAC FOR CONSTELLATION DISPLAY